0000000000416646
AUTHOR
Mayken Visser
Predictive Value for Increased Factor XIa and Plasma Kallikrein Activity in Acute Venous Thromboembolism
Abstract Venous thromboembolism (VTE) is associated with increased coagulation activity, which in part can be attributed to the contact pathway of coagulation. Evidence from pre-clinical and epidemiological studies suggests that deficiency in factors of contact activation (e.g. coagulation factors (F) XI and FXII) protects against VTE. However, limited information exists regarding the activation of the contact system in the setting of acute VTE. In the current study, patients with confirmed VTE events (n=321) from the VTEval study and controls (n=300) from the population-based PREVENT-it pilot study were included. Plasma samples were collected from patients after confirmed VTE events or con…
Atherothrombosis and Thromboembolism: Position Paper from the Second Maastricht Consensus Conference on Thrombosis
AbstractAtherothrombosis is a leading cause of cardiovascular mortality and long-term morbidity. Platelets and coagulation proteases, interacting with circulating cells and in different vascular beds, modify several complex pathologies including atherosclerosis. In the second Maastricht Consensus Conference on Thrombosis, this theme was addressed by diverse scientists from bench to bedside. All presentations were discussed with audience members and the results of these discussions were incorporated in the final document that presents a state-of-the-art reflection of expert opinions and consensus recommendations regarding the following five topics: 1. Risk factors, biomarkers and plaque inst…
Plasma Kallikrein Contributes to Coagulation in the Absence of Factor XI by Activating Factor IX
Objectives: FXIa (factor XIa) induces clot formation, and human congenital FXI deficiency protects against venous thromboembolism and stroke. In contrast, the role of FXI in hemostasis is rather small, especially compared with FIX deficiency. Little is known about the cause of the difference in phenotypes associated with FIX deficiency and FXI deficiency. We speculated that activation of FIX via the intrinsic coagulation is not solely dependent on FXI(a; activated FXI) and aimed at identifying an FXI-independent FIX activation pathway. Approach and Results: We observed that ellagic acid and long-chain polyphosphates activated the coagulation system in FXI-deficient plasma, as could be demo…